#1 advantage of plastic wads (with shotcups, of course) is, in my opinion, that they eliminate lead fouling in the barrel.
#2 advantage is tightening the patterns and cutting down on the number of flyers. Of course, tightening the patterns may, or may not, be considered an advantage, depending on your intended use.
I've only ever seen bad plastic fouling when I started reloading and, being extra cautious, loaded waaaay light and got a significant number of bloopers or burners that left stalactites in the bores. With properly loaded shells there will be some level of plastic fouling, but that's a lot easier to clean than lead.
Last edited by Dave in Maine; 02/29/12 10:50 PM.
